Description
The HC-05 Bluetooth Module is a versatile and widely used serial communication module.
Unlike the HC-06, it can operate as master or slave, making it suitable for both point-to-point and master-slave Bluetooth applications.
It communicates via UART (TX/RX) and is compatible with Arduino, ESP32, ESP8266, and Raspberry Pi, enabling wireless control, sensor data transmission, and remote debugging.
HC-05 is ideal for robotics, IoT, home automation, and wireless serial communication projects.
Key Features
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Bluetooth 2.0 + EDR serial module
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Operates in master or slave mode
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UART interface (TX, RX)
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Communication range up to 10 meters
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Compatible with 3.3V – 5V logic levels
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Easy integration with Arduino, ESP32, ESP8266, and Raspberry Pi
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Low power consumption and compact design
Specifications
| Feature | Details |
|---|---|
| Operating Voltage | 3.3V – 5V DC |
| Communication Interface | UART (TX/RX) |
| Baud Rate | Default 9600 bps (configurable via AT commands) |
| Bluetooth Version | 2.0 + EDR |
| Range | Up to 10 meters |
| Logic Levels | 3.3V / 5V compatible |
| Current Consumption | ~30 mA |
| Dimensions | 36 × 15 mm (approx.) |
Applications
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Wireless serial communication between microcontrollers and PCs
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Remote-controlled robotics and IoT projects
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Home automation and smart devices
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Serial debugging and monitoring
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Sensor data transmission to mobile apps
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Educational and DIY electronics projects
Compatible Boards / Circuits
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Arduino (Uno, Nano, Mega)
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ESP32 / ESP8266
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Raspberry Pi
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UART-enabled devices for wireless serial communication
Reviews
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